Add cleanup on install or bulk action

I'm looking for this, if somebody can guide what the approach would be I can write a patch.

It should NOT be at module install, and it should only be done for enabled fields (by entity_reference_purger).

1. check the field table for missing references
2. tell entity_reference_purger that those references are deleted
3. show how many items were removed and/or how many added to a queue

example:
1. Query like this needs to be done using field and database api (for all enabled fields)

"
SELECT DISTINCT(field_my_media_items_target_id)
 FROM `node__field_my_media_items`
 WHERE field_my_media_items_target_id not in 
  (select mid from media);"

2. call function entity_reference_purger_purge_by_entity_properties('media', $entity_id) where entity_id is a missing media id
see 📌 refactor entity_reference_purger_entity_delete() for readability Needs review